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id say cpu limited playing with everything on with a 4850 at 1680x1050 60 fps solid .
game aint that demanding on graphics but cpus a different ball park.
so if you could bag your self maybe a cheap q6600 and clock it that would be my first stop. this game loves the quads and can double fps in some instances from a dualcore.
go quad - your gpu should be fine.
Guys I can't believe people keep saying the same WRONG thing over and over.
Yes, a quad will be beneficial but the GPU is still clearly the bottleneck here. From upgrading a GPU he would see FAR more of an increase in FPS than upgrading the CPU.